
M451
May. 4, 2018
Page
260
of
1006
Rev.2.08
M4
51
S
E
RI
E
S
T
E
CH
NICA
L RE
F
E
R
E
NC
E
M
A
NU
A
L
[26]
PENDSTSET
SysTick Exception Set-pending Bit
Write Operation:
0 = No effect.
1 = Changes SysTick exception state to pending.
Read Operation:
0 = SysTick exception is not pending.
1 = SysTick exception is pending.
[25]
PENDSTRTC_CA
L
SysTick Exception Clear-pending Bit
Write Operation:
0 = No effect.
1 = Removes the pending state from the SysTick exception.
Note:
This is a write only bit. To clear the PENDST bit, you must “write 0 to PENDSTSET
and write 1 to PENDSTRTC_CAL” at the same time.
[24]
Reserved
Reserved.
[23]
ISRPREEMPT
Interrupt Preempt Bit (Read Only)
If set, a pending exception will be serviced on exit from the debug halt state.
[22]
ISRPENDING
Interrupt Pending Flag, Excluding NMI and Faults (Read Only)
0 = Interrupt not pending.
1 = Interrupt pending.
[21:18]
Reserved
Reserved.
[17:12]
VECTPENDING
Number of the Highest Pended Exception
Indicate the Exception Number of the Highest Priority Pending Enabled Exception
0 = no pending exceptions.
Nonzero = the exception number of the highest priority pending enabled exception.
The value indicated by this field includes the effect of the BASEPRI and FAULTMASK
registers, but not any effect of the PRIMASK register.
[11]
RETTOBASE
Preempted Active Exceptions Indicator
Indicate whether There are Preempted Active Exceptions
0 = there are preempted active exceptions to execute.
1 = there are no active exceptions, or the currently-executing exception is the only active
exception.
[10:6]
Reserved
Reserved.
[5:0]
VECTACTIVE
Number of the Current Active Exception
0 = Thread mode.
Non-zero = The exception number of the currently active exception.
Содержание ARM Cortex NuMicro M451 Series
Страница 301: ...M451 May 4 2018 Page 301 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL...
Страница 324: ...M451 May 4 2018 Page 324 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL Figure 6 4 18 Checksum Calculation Flow...
Страница 355: ...M451 May 4 2018 Page 355 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 2 0 Reserved Reserved...
Страница 625: ...M451 May 4 2018 Page 625 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL 00 5 bits 01 6 bits 10 7 bits 11 8 bits...
Страница 721: ...M451 May 4 2018 Page 721 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL the SCL line 1 0 Reserved Reserved...
Страница 1001: ...M451 May 4 2018 Page 1001 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 10x10x1 4 mm footprint 2 0 mm 9 2...
Страница 1002: ...M451 May 4 2018 Page 1002 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 64L 7x7x1 4 mm footprint 2 0 mm 9 3...
Страница 1003: ...M451 May 4 2018 Page 1003 of 1006 Rev 2 08 M451 SERIES TECHNICAL REFERENCE MANUAL LQFP 48L 7x7x1 4mm footprint 2 0mm 9 4...